diff --git a/src/PSUEvent.cpp b/src/PSUEvent.cpp
index 8c83d06..27bb8b1 100644
--- a/src/PSUEvent.cpp
+++ b/src/PSUEvent.cpp
@@ -218,7 +218,7 @@
 void PSUSubEvent::restartRead()
 {
     std::weak_ptr<PSUSubEvent> weakRef = weak_from_this();
-    waitTimer.expires_from_now(boost::posix_time::milliseconds(eventPollMs));
+    waitTimer.expires_from_now(std::chrono::milliseconds(eventPollMs));
     waitTimer.async_wait([weakRef](const boost::system::error_code& ec) {
         if (ec == boost::asio::error::operation_aborted)
         {